(function () {
    class Person {
        constructor(firstName, lastName) {
            this.firstName = firstName;
            this.lastName = lastName;
            this.fullName = this.firstName + "_" + this.lastName;
        }
    }
    function showName(person) {
        return `我的全称是${person.firstName}${person.lastName}`;
    }
    let person = new Person("欧阳", "娜娜");
    // console.log(person)
    let result = showName(person);
    console.log(result);
})();
